Hexagonal close packing is one of two crystal structures that derive from stacking close-packed-planes of hard sphere atoms. In the HCP structure only two stacking ...

and the hexagonal Wurtzite (lower diagram). In the zinc blend structure the sulphur ions form an fcc structure and the zinc ions occupy half of the tetrahedral sites in this structure to attain charge ...

Snowflakes form when a cold water droplet freezes onto particulates (like dust or pollen) in the atmosphere, creating an ice ...

Material does not stick well to (the prism’s) flat surfaces, and that comes from the lattice structure of the ice crystal,” Libbrecht ... prism – a little hexagonal prism.” ...